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Relating Structural Phase Transitions to Mechanoluminescence: The Case of the Ca 1−xSr xAl 2Si 2O 8:1%Eu 2+,1%Pr 3+ Anorthite

34 Pages Posted: 1 Aug 2019 First Look: Accepted

See all articles by Ang Feng

Ang Feng

Ghent University - LumiLab; Ghent University - Center for Nano and Biophotonics (NB Photonics)

Simon Michels

Ghent University - LumiLab; Ghent University - Center of Nano- and BioPhotonics (NB Photonics)

Alfredo Lamberti

Ghent University - Mechanics of Materials and Structures (MMS)

Wim Van Paepegem

Ghent University - Mechanics of Materials and Structures (MMS)

Philippe F. Smet

Ghent University - LumiLab; Ghent University - Center of Nano- and BioPhotonics (NB Photonics)

Abstract

The phenomenon of mechanoluminescence (ML), where phosphors emit light when pressure is applied, is considered to be closely related to the crystallographic structure of those phosphors. In this work we unravel this connection for the anorthite solid solution Ca1−xSrxAl2Si2O8, which displays two important phase transitions as a function of strontium content x (denoted as xSr), i.e., the nearly second-order P1̅-I1̅ transition and the ferroelastic I1̅-I2/c transition at ambient temperature and pressure. The spontaneous strains reveal that the ferroelastic transition takes place when xSr ∈ (0.70, 0.75), while other optical methods suggest that the second-order P1̅−I1̅ transition takes place when xSr is around 0.4. The ML intensity reaches its maximum when the second order transition takes place and drops to zero when the phosphors undergo the ferroelastic transition. The first transition already brings significant changes to electron occupations at traps in this solid solution. The structural phase transitions in the anorthite solid solutions are reflected in specific ML properties, such as the ML intensity and the load threshold. Further analysis suggests this is due to the structural change of the hosts and the trap properties (trap density and electron population function). Analysis of the ML dynamics may therefore serve as a useful tool to investigate phase transitions in ML phosphors.

Keywords: solid solution, phase transition, mechanoluminescence, thermoluminescence, defects

Suggested Citation

Feng, Ang and Michels, Simon and Lamberti, Alfredo and Paepegem, Wim Van and Smet, Philippe F., Relating Structural Phase Transitions to Mechanoluminescence: The Case of the Ca 1−xSr xAl 2Si 2O 8:1%Eu 2+,1%Pr 3+ Anorthite (2019). Available at SSRN: https://ssrn.com/abstract=3427541 or http://dx.doi.org/10.2139/ssrn.3427541

Ang Feng

Ghent University - LumiLab ( email )

Krijgslaan 281-S1
Gent, 9000
Belgium

Ghent University - Center for Nano and Biophotonics (NB Photonics) ( email )

Gent
Belgium

Simon Michels

Ghent University - LumiLab

Krijgslaan 281-S1
Gent, 9000
Belgium

Ghent University - Center of Nano- and BioPhotonics (NB Photonics)

Gent
Belgium

Alfredo Lamberti

Ghent University - Mechanics of Materials and Structures (MMS)

Tech Lane Ghent Science Park 46
Zwijnaarde, 9052
Belgium

Wim Van Paepegem

Ghent University - Mechanics of Materials and Structures (MMS)

Tech Lane Ghent Science Park 46
Zwijnaarde, 9052
Belgium

Philippe F. Smet (Contact Author)

Ghent University - LumiLab ( email )

Krijgslaan 281-S1
Gent, 9000
Belgium

Ghent University - Center of Nano- and BioPhotonics (NB Photonics) ( email )

Gent
Belgium

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